Hundreds of Inter ultras were intercepted by Italian police prior to the clash between the Nerazzurri and Napoli.
The buses of fans were blocked by officials at the Napoli north freeway exit and subsequently searched by police.
According to Il Mattino, the supporters were found to be carrying knives and wooden bats.
The report states many of the fans were drunk, with all offenders identified and detained.
During the evening they will be taken back to the regional border between Campania and Lazio under strict police escort.
